Low Energy and Sustainable Ventilation Technologies for Green Buildings (Book of Proceedings)

The Proceedings of the 31st AIVC Conference " Low Energy and Sustainable Ventilation Technologies for Green Buildings", held in Seoul, Korea, 26-28 October 2010.

Air Leakage Tests for the requirements of the LEED in two high-rise residential buildings

Air leakage test was carried out according to ASTM E779-03, Standard Test Method for Determining Air Leakage Rate by Fan Pressurization to meet the requirements of the LEED-NC v2.2(EQp2). Air leakage tests for quality assurance can be performed once all work on the air barrier has been completed and all windows and doors have been installed in two high-rise residential buildings. Test units selection was carried out in accordance with the following guidance, California’s 2001 Energy Efficiency Standards.

Study on the Feasibility of Heat Pump Desiccant System Combined with Cogeneration System in Heating and Humidification Mode

Recently, in order to reduce energy consumption in the building sector, many air-conditioning systems have been proposed and applied to real buildings. Of particular note, air-conditioning systems that treat sensible and latent loads separately have been assessed as efficient in hot and humid climates. In this study, a highly efficient desiccant system combined with a cogeneration system and a heat pump desiccant system has been developed.

PCM cold storage under various ventilation conditions

Cold storage is a way to deal with peak cooling loads. Cold storage integrated with building structures is independent of the approach used for building cooling – it can be used with passive cooling as well as mechanical cooling. High thermal storage capacity in a narrow temperature interval makes phase change materials (PCMs) a suitable medium for cold storage in built environments. A set of experiments was performed with the aim to investigate performance of PCM cold storage in building structures under various ventilation strategies.

Effective flow area estimation test using CO2

We developed a method for estimating effective flow areas not only in the external wall of a house but also in the internal walls between rooms using only one type of tracer gas. This method is based upon the following hypotheses: (1) the temperature and tracer-gas concentration in the room is homogenous, (2) the air in the room is in a windless state, (3) there is no error in the measurement of tracer-gas concentration. However, we know that in reality, these hypotheses are not entirely true.

Filtering technology for air purification in HVAC

This paper is mainly present the filtering technology for air purification in the process of ventilation and air conditioning. By the means of reviewing the related research we have made in this area, several effective programs for PM10 filtration are introduced from the view of experimental testing and practical applications. However, the selection and screening of fiber filter material has yet to be standardized, and the development of new multi-functional and energy efficient fiber filter material is pressingly required.

Evaluation on the Daylighting performance of ‘generative façade components’ In the digital simulation

The aim of this study is to find out a role of the computer simulation on sustainable design projects and development of façade elements with results of daylighting simulation and energy performance. 3D components of façade modeling get to realized in Rhino 3d with some help of Paracloud encoding. With simulation program of Ecotect and eQuest, thus, the result will show influencing factors of each generative components on the radiation & dayligthing factors.

Analytical estimation of optimal minimum airflow for air circulation

Space conditions are directly controlled by terminal boxes in variable air volume (VAV) air handling unit (AHU) systems. The terminal box either modulates airflow or adjusts discharge air temperature. Conditioned space will have thermal discomfort by less air circulation if the airflow and discharge air temperature are not suitable. The objective of this study is to estimate an optimal value of the airflow and discharge air temperature, which maintains room thermal comfort.

Sensitivity Analysis of Parameters affecting Indoor Air Quality related to HCHO and TVOC Reduction

The objective of the study is to analyze the relative performance of factors affecting indoor air quality in multi-residential buildings in Korea. A study of the factors affecting indoor air quality is essential for establishing indoor air quality management strategies effectively. To observe the indoor air quality response following a modification of a given parameter sensitivity analysis was performed. The factors examined for the analysis include; wall+ceiling paper, adhesive for wall/ceiling paper, floor material, adhesive for floor material, and ventilation rate.

Prediction of mass transfer rate on the surface of tested building material using CFD analysis

We developed an airflow control unit for small chambers for uniformly controlling airflow on the surface of tested building material in the small chambers. We will present the mass transfer rate on the surface of tested building materials corresponding to an actual building in order to exactly evaluate the performance of the reduced amount and concentration of released chemical materials with the small chambers. We measured the airflow velocity on the surface of building materials in the small chamber with the developed airflow control unit and the fan speed for airflow control.